Grate-bar



(No Model.)

SMITH.

GRATB BAR.

No. 298,424. Paten ted May 13, 1884.

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GRATE-BAR.

SPECIFICATION forming part of Letters Patent 1\l'o. 298,424, dated May 13,1884.

Application filed August 16, 1883. I (No model.)

To rzZZ whom it may concern.-

Be it known that I, STERRY SMITH, a citizen of the United States, residing at Salem, in the county of Essex and State of Massachusetts, have invented anew and useful Improvement in Grate-Bars, of which the following is a specification.

My invention relates to an improvement in that class of grate-bars used in steam-boiler furnaces; and it has for its object the construction of a grate-bar which shall combine the greatest strength with the least necessary amount of metal.

The invention consists of a grate-bar constructed with a series of central longitudinal bars and a series of angular bars in front and rear of the said central bars, and also with longitudinal bars at each end of the grate.

Referring to the accompanying drawings, Figure 1 is a top or plan view of a grate-bar embodying my invention. Fig. 2 is a longitudinal vertical section of the same on the line w w. Fig. 3 is a vertical transverse section on the line y y of Fig. 1.

a a are the sides of the bar, and extend below the central portion, as indicated in Figs. 2 and 3. At the central portion of the gratebar are longitudinal bars I) b, which are parallel with the side bars, a a, and are provided with lugs or stays connecting them together transversely. At each end of the grate-bar are longitudinal bars 0, connected with the end pieces, f f, and with the angular bars d d. The central longitudinal bars, b, are connected to angular bars 0 c at each end, and between the bars 0 and dis a series of angular bars. 9 g, the angles of which are placed in opposte directions on each side, as shown in Fig. 1. The upper surfaces of the series of bars may be grooved in the direction of their length, it desirable. By making the bars 9 g of angular form, the tendency is to change the direction of the air and distribute it more evenly as it passes under and through the bar and the fuel, and thus facilitates the combustion of the fuel. The inner bars, (I, g, and c, are deeperat the ends, where they join the side bars, ff, than at and toward the center, as indicated in Fig. 3, by which a strong support is given to said bars, and at the same time the amount of metal is diminished more than if all were of the same depth.

NVhat I claim as my invention is- The combination and arrangement of the two side bars, a (1, extending below the main body of the grate-bar, the short longitudinal bars e e at each end of the grate, the central longitudinal bars, I) b, and the intermediate angular bars, 9 9, arranged as shown, and for the purpose set forth.

In testimony whereof I havesigned my name -to this specificationin the presence of two subscribing witnesses.

STERRY SMITH.

' Witnesses:

'J, H. ADAMS, E. PLa TA. 

